Electrical Energy (BI.11) Practice

Energy comes in many forms, and several are often present at once. Which forms of energy are most represented by a lit light bulb?

• chemical, light, heat

• electrical, light, heat

• electrical, light, sound

• mechanical, light, heat

Many devices we use everyday transform electrical energy into other forms of energy. Whenever energy changes form, some is given off as heat.

Which device below changes

electrical energy into another form and gives off the most heat energy as well?

• radio

• kitchen blender

• remote control car

• light bulb

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NGSS.MS-PS3-3

Sofia charged a plastic comb by running it through her hair on a dry day. Then she brought it close to some uncharged pieces of tissue.

What happened to the tissue?

• They were neither attracted nor repelled by the comb.

• They were repelled by the comb before the comb touched them.

• They were attracted by the comb before the comb touched them.

• They were attracted by the comb only after the comb touched them.

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Sound energy comes from many sources. Which of these examples of sound energy was converted from electrical energy?

• fireworks

• trumpet blast

• rumbling car engine

• music on a stereo speaker

Brad has a small DC hobby motor, a battery, and a switch. How many pieces of wire does he need to connect them into a circuit?

• 2

• 3

• 4

• 6

Students in a science class studied electricity. One student group made the poster above. Which would be the best title for the group's poster?

• heat insulators

• electrical insulators

• chemical conductors

• electrical conductors

Polyester cloth often has a negative charge. Dry human skin often has a positive charge.

What can happen between polyester clothing and human skin on a dry day?

• The clothing tends to be attracted to the skin even before they make contact.

• The clothing tends to be repelled by the skin even before they make contact.

• The clothing is first repelled by the skin, and then attracted after they make contact.

• The clothing is first attracted to the skin, and then is repelled after they make contact.

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NGSS.MS-PS2-3

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Electrical energy is often converted to other forms. Which device below has the main function

of converting electrical energy into energy of motion?

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Melinda was experimenting with a battery and 4 light bulbs. She connected them in different ways to see what would happen. Which picture shows a way she could connect them so that four light bulbs light up?

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In electrical machinery, certain insulating materials are used to keep the electrical energy flowing safely inside the conductor materials. Which of these would NOT be a good material for electrical insulation?

• glass

• rubber

• silver

• wood

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NGSS.MS-ETS1-2